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109806 |
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|a dc
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|a Monsalve, Raul A.
|e author
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|a Haystack Observatory
|e contributor
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|a Rogers, Alan E E
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|a Bowman, Judd D.
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|a Mozdzen, Thomas J.
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|a Rogers, Alan E E
|e author
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|a CALIBRATION OF THE EDGES HIGH-BAND RECEIVER TO OBSERVE THE GLOBAL 21 cm SIGNATURE FROM THE EPOCH OF REIONIZATION
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|b IOP Publishing,
|c 2017-06-13T12:58:17Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/109806
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|a The EDGES High-Band experiment aims to detect the sky-average brightness temperature of the 21 cm signal from the epoch of reionization in the redshift range 14.8≳ z ≳ 6.5.To probe this redshifted signal, EDGES High-Band conducts single-antenna measurements in the frequency range 90-190 MHz from the Murchison Radio-astronomy Observatory in Western Australia. In this paper, we describe the current strategy for calibration of the EDGES High-Band receiver and report calibration results for the instrument used in the 2015-2016 observational campaign. We propagate uncertainties in the receiver calibration measurements to the antenna temperature using a Monte Carlo approach. We define a performance objective of 1 mK residual rms after modeling foreground subtraction from a fiducial temperature spectrum using a five-term polynomial. Most of the calibration uncertainties yield residuals of 1 mK or less at 95 % confidence. However, current uncertainties in the antenna and receiver reflection coefficients can lead to residuals of up to 20 mK even in low-foreground sky regions. These dominant residuals could be reduced by (1) improving the accuracy in reflection measurements, especially their phase, (2) improving the impedance match at the antenna-receiver interface, and (3) decreasing the changes with frequency of the antenna reflection phase.
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|a National Science Foundation (U.S.) (AST-0905990)
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|a National Science Foundation (U.S.) (AST-1207761)
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|a United States. National Aeronautics and Space Administration (NNA09DB30A)
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|a United States. National Aeronautics and Space Administration (NNX12AI17G)
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|a United States. National Aeronautics and Space Administration (NNX16AF59G)
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|a en_US
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|a Article
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|t Astrophysical Journal
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